102 lines
3.5 KiB
C++
102 lines
3.5 KiB
C++
#pragma once
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#include <arpa/inet.h>
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#include <png.h>
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#include <cassert>
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#include "color.h"
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#include "coord.h"
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template <uint32_t X, uint32_t Y, uint32_t C>
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class Image : public std::array<std::array<Color<C>, X>, Y> {
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public:
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constexpr const Color<C>& GetPixel(const Coord<2>& coord) const;
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void SetPixel(const Coord<2>& coord, const Color<C>& color);
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void DrawXLine(const Coord<2>& start, const Color<C>& color, uint32_t length);
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void DrawYLine(const Coord<2>& start, const Color<C>& color, uint32_t length);
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void DrawRectangle(const Coord<2>& start, const Color<C>& color, uint32_t x_length, uint32_t y_length);
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void DrawSquare(const Coord<2>& start, const Color<C>& color, uint32_t length);
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std::string ToPng();
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};
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template <uint32_t X, uint32_t Y, uint32_t C>
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constexpr const Color<C>& Image<X, Y, C>::GetPixel(const Coord<2>& coord) const {
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return this->at(coord.at(1)).at(coord.at(0));
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}
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template <uint32_t X, uint32_t Y, uint32_t C>
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void Image<X, Y, C>::SetPixel(const Coord<2>& coord, const Color<C>& color) {
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this->at(coord.at(1)).at(coord.at(0)) = color;
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}
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template <uint32_t X, uint32_t Y, uint32_t C>
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void Image<X, Y, C>::DrawXLine(const Coord<2>& coord, const Color<C>& color, uint32_t length) {
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auto& row = this->at(coord.at(1));
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for (uint32_t x = coord.at(0); x < std::min(X, coord.at(0) + length); ++x) {
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row.at(x) = color;
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}
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}
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template <uint32_t X, uint32_t Y, uint32_t C>
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void Image<X, Y, C>::DrawYLine(const Coord<2>& coord, const Color<C>& color, uint32_t length) {
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for (uint32_t y = coord.at(1); y <= std::min(Y, coord.at(1) + length); ++y) {
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SetPixel({{{coord.at(0), y}}}, color);
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}
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}
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template <uint32_t X, uint32_t Y, uint32_t C>
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void Image<X, Y, C>::DrawRectangle(const Coord<2>& start, const Color<C>& color, uint32_t x_length, uint32_t y_length) {
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DrawXLine(start, color, x_length);
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DrawXLine({{{start.at(0), start.at(1) + y_length}}}, color, x_length);
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DrawYLine(start, color, y_length);
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DrawYLine({{{start.at(0) + x_length, start.at(1)}}}, color, y_length);
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}
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template <uint32_t X, uint32_t Y, uint32_t C>
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void Image<X, Y, C>::DrawSquare(const Coord<2>& start, const Color<C>& color, uint32_t length) {
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DrawRectangle(start, color, length, length);
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}
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static inline void WriteCallback(png_structp png_ptr, png_bytep data, png_size_t length) {
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auto dest = static_cast<std::string*>(png_get_io_ptr(png_ptr));
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dest->append(reinterpret_cast<char*>(data), length);
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}
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template <uint32_t X, uint32_t Y, uint32_t C>
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std::string Image<X, Y, C>::ToPng() {
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static_assert(C == 3); // PNG only supports RGB
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std::string ret;
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auto png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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assert(png_ptr);
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auto info_ptr = png_create_info_struct(png_ptr);
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assert(info_ptr);
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png_set_write_fn(png_ptr, &ret, &WriteCallback, nullptr);
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png_set_IHDR(png_ptr, info_ptr, X, Y,
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16, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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png_write_info(png_ptr, info_ptr);
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for (auto& row : *this) {
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std::array<uint16_t, X * 3> out_row;
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for (uint32_t x = 0; x < X; ++x) {
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out_row[x * 3 + 0] = htons(static_cast<uint16_t>(row[x].at(0)));
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out_row[x * 3 + 1] = htons(static_cast<uint16_t>(row[x].at(1)));
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out_row[x * 3 + 2] = htons(static_cast<uint16_t>(row[x].at(2)));
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}
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png_write_row(png_ptr, reinterpret_cast<unsigned char*>(out_row.data()));
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}
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png_write_end(png_ptr, nullptr);
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png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
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png_destroy_write_struct(&png_ptr, &info_ptr);
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return ret;
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}
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